Passing flagged parameters to bash script

script.sh

#!/usr/bin/env bash

while getopts u:d:p:b: option
do
case "${option}"
in
u) _USER=${OPTARG};;
p) _PASSWORD=${OPTARG};;
b) _BUILD=${OPTARG};;
esac
done

echo "USER: $_USER  PASSWORD: $_PASSWORD  BUILD: $_BUILD"